MTC Terminal Downlink Channel Repetition Subframe Allocation
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Solution Overview
Problem
Machine Type Communication (MTC) terminals face challenges in maintaining communication with base stations in poor radio environments due to limited coverage and the need for improved communication power, requiring efficient transmission and reception of control and data channels.
Innovation Solution
The method involves defining subframe rules for repeated transmission of control channels, such as PBCH, PRACH, PDSCH, PDCCH, and EPDCCH, to enhance coverage and communication efficiency between MTC terminals and base stations, with the base station determining specific subframes for repetition transmission and the terminal decoding control information to receive downlink data channels accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC terminals repeatedly transmit control information and data information through physical channels to improve coverage, then communication coverage and reliability are improved, but transmission time and system complexity increase
Solution Approach 1:
The patent segments the physical channels into control channels (PDCCH, EPDCCH) and data channels (PDSCH), applying different repetition strategies to each. Control channels are repeated a first number of times while data channels are repeated a second number of times, allowing optimized timing for each channel type rather than uniform repetition across all channels.
Solution Approach 2:
The patent introduces dynamic determination of repetition numbers based on channel conditions and terminal requirements. The base station determines the first and second numbers of repetitions dynamically rather than using fixed values, allowing the system to adapt transmission time to actual communication needs and improve reliability when necessary while reducing time when conditions permit.
2Reliability
If MTC terminals repeatedly transmit control information and data information through physical channels to improve coverage, then communication coverage and reliability are improved, but device complexity increases
Solution Approach 1:
The patent divides the transmission process into separate control channel transmission and data channel transmission phases with distinct repetition mechanisms. This segmentation allows the base station to manage complexity by handling control information and data information through different, optimized pathways rather than a single complex unified process.
Solution Approach 2:
The patent employs feedback mechanisms where the base station determines repetition numbers based on received signals and channel conditions from MTC terminals. This feedback loop allows the system to adjust transmission complexity dynamically based on actual communication quality, reducing unnecessary repetitions when conditions are good while increasing them when reliability is compromised.
3Productivity
If the base station determines specific subframes for repeated transmission of control channels, then transmission efficiency is improved, but scheduling complexity increases
Solution Approach 1:
The patent applies preliminary determination of subframe allocations where the base station pre-determines which subframes will be used for control channel repetitions and which for data channels. This advance planning improves transmission efficiency by optimizing resource allocation while the structured approach to subframe selection helps manage scheduling complexity through systematic rather than ad-hoc decision-making.
Data Source
AI summary
The present invention relates to a method and an apparatus for a base station transmitting a downlink signal for a machine-type communication (MTC) terminal. More specifically, the present invention relates to a method for transmitting and receiving PBCH, PRACH, PDSCH, PDCCH, EPDCCH for a low cost and enhanced coverage MTC terminal, and an apparatus therefor. Particularly, provided are an apparatus and a method for a base station transmitting a control channel, the method comprising the steps of repeatedly transmitting a control channel comprising control information, and repeatedly transmitting downlink data channel (PDSCH) on the basis of information for a subframe ending the control channel being repeatedly transmitted.